Delta AH Series Operation Manual page 286

AH Mo t io n C on tr o ll er - O p er at i on Ma n ua l

I/O Refreshing and Communication Service
I/O refreshing
_A1
A CPU module reads external I/O data periodically or output data to external I/O. I/O refreshing includes the
following.
 Refreshing data in a digital I/O module
 Refreshing data in an analog I/O module
 Refreshing data in a network module
 Refreshing data in a motion control module
All I/O refreshing is executed in the same loop. The data in an input device is refreshed before a program is
executed, and the data in an output device is refreshed after the program is executed.
Unit
Digital I/O module
Analog I/O module
Network module
Motion control module
Communication service
Communication service is nonscheduled communication service of a network module. It includes the
communication request sent from external equipment to a CPU module, and the communication request sent from
the CPU module to the external equipment.
A - 8
Maximum data exchange
It depends on the number of input/output channels in the unit.
It depends on the number of input/output channels in the unit.
It depends on the unit.
It depends on the unit.
Data exchange area
Input relay/Output relay
Data register
Data register
Data register